Dobby lever



Apr. 17, 1923. 1 I 1,451,828

E. R. HOLMES DOBBY LEVER Filed 0013.. 27 1921 i etented Apr. 1?,

ELBRIDGE R. HOLMES, OF WORCESTER, RIASSACHUSETTS, ASSIGNOR- TO CROIVIPTON 8c KNOWLES LOOIM WORKS, 015 WORCESTER, TvTASSACI-IUS'ETTS. A CORPORATION OF MASSACHUSETTS.

DDBBY LEVER.

Application filed (lctobcr 27, 1921.

, State of Massachusetts, have invented a new and useful Dobby Lever, oi? which the following is a specification.

This invention relates to a dobby lever particularly designed for use in loom dobbies. Large numbers of these levers are used in each loom dobby and the space provided for them is extremely limited in width. Furthermore the levers are subject to often repeated heavy strains, resulting in relatively rapid wear and requiringfrequent replacement thereof.

It is the object of my invention to provide an improved construction of dobby levers, so designed that it may be easily and cheaply manufactured and that the parts may be easily renewed without dismantling the dobby.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which Fig. 1 is a side elevation of certain parts of a loom harness mechanism, including my improved dobby lever;

F ig. 2 is an enlarged side elevation of the dobby lever and one of the hooks associated therewith;

Fig. 3 is an edge view of the parts shown in Fig. 2, looking in the direction of the arrow 3 in said figure;

Fig. 4: is a detail sectional edge view, taken along the line 44 in Fig. 2;

Fig. 5 is an edge view of the two parts from which the lever is constructed, and

Fig. 6 is a sectional view taken along the line 6-6 in Fig. 2.

Referring to Fig. 1. I have shown a har- 0 ness jack 10, a dobby lever 11, upper and lower hooks 12 and 13, a lifter rod 14 and a pair of dobby fingers 15 and 16.

The dobby lever 11 is constructed of two similar strips of sheet material 17 and 18, secured together by rivets or other fastening devices 19. The sheet metal of which the parts 17 and 18 are formed is preferably a relatively hard sheet steel possessing a com siderable degree of resilience.

Seriai No. 510.842.

The parts are first formed in the shape shown in Fig. 5, with oiiset end portions 20 at one end and with lugs or projections 21 at both ends of each strip. Thetwo end portions of each strip are then bent at an angle to the intermediate portion, giving the strips the general outline indicated in F ig. 5.

he strips are then placed face to face and are forced together until the intermediate portions are in engagement. The parts are secured in this position by the rivets 19. This procedure places the engaging end portions of the strips 17 and 18 under a considerable spring tension, so that they will firmly retain the hooks 12 and 13, when pivotally mounted between them.

The hooks 12 and 13 are preferably provided with integral bosses 22, (Fig. 6) at each side thereof, adapted to be received in openings 23 in the ends of the levers 11. The pivotal end of each hook is freely movable between the ends of the strips 17 and 18, which are sufliciently separated for this purpose by the engaging lugs or projections 21. The opposite ends of the hooks 12 and 13 are so designed that one of the hooks may be used as a tool for spreading the strips of a lever to permit removal or replacement of another hook.

This operation of inserting a hook is illustrated in Fig. 1 of the drawings, in which it will be noticed that the rivets 19 are at such a distance from the ends of the lever 11 as to permit th necessary spreading of the end portions without permanently distorting the strips 17 and 18. These parts spring strongly back to their original positions when released and firmly retain the hooks in position while permitting free pivotal movement thereof.

The lugs or projections 22 also form a portion of the back edge of the dobby lever which engages the dobby girts 24 during the operation of the machine.

It should be noticed that the parts 17 and 18, as shown in the drawing, are exact duplicates of each other, so that a single set of parts only is required in the construction of the lever 11.

Having thus described my invention, it will be evident that changes and modifications can be made therein by those skilled in the art within the spirit and scope of my invention as set forth in the claims and I do not Wish to be otherwise limited to the details herein disclosed but What I claim is 1. A loom dobby' lever comprising two strips of resilient sheet metal having end bearing portions'for dobby hooks said strips being secured together under spring tension at points relatively remote from said end bearing portions, said bearing portions being in firm contact under spring tension but yieldingly separable for the attachment of a dobby hook thereto.

2. A loom dobby lever comprising tWo similar strips of resilient sheet metal having end bearing portions for dobby hooks, each strip being otlset at one nd and having proecting portions at both ends, said projecting portions engaging each other to determine the space between said strips and means to secure said strips together under spring tension.

The process of making a dobby lever which consists in forming similar sheet metal elements having and bearing portions, bending the end portions or the elements out of alignment with the center portion forcing the center portions of the elements into close contact and securing the parts in such position at points relatively remote from the end bearings, whereby said end bearing portions are held in firm contact under spring tension but may be yieldingly separated for the attachment of a dobby hook thereto.

In testimony whereof 1 have hereunto atfixed my signature.

ELBRIDGE RN HOLMES. 

